Heater



FIG. 1 is a perspective view of a heater, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof, the right side view being a mirror image of FIG. 5 ;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged detail view of area 8 circumscribed within FIG. 1 .

The evenly spaced broken lines depict portions of the heater that form no part of the claimed design. The dot dash dot broken lines denote the boundaries of the detail areas and form no part of the claim. 

CLAIM The ornamental design for a heater, as shown and described. 